Any vibration frequency beyond the range of hearing frequencies. ultrasonic or subsonic, infrasound__
See Vibratory Physics - The Connecting Link between Mind and Matter
See Also
15.09 - Dissociating Water with Ultrasonic Vibration - Puharich
cochlea
INAUDIBLE VIBRATIONS
Inaudible Vibration
Silence
high silence
infrasound
low silence
ultrasound